svn-gvsig-desktop / tags / v1_0_2_Build_910 / libraries / libGDBMS / src / main / java / com / hardcode / gdbms / engine / values / NullValue.java @ 11275
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package com.hardcode.gdbms.engine.values; |
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import java.io.Serializable; |
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import java.sql.Types; |
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import com.hardcode.gdbms.engine.instruction.IncompatibleTypesException; |
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/**
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* DOCUMENT ME!
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*
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* @author Fernando Gonz?lez Cort?s
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*/
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public class NullValue extends AbstractValue implements Serializable { |
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/**
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public String toString() { |
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return ""; |
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} |
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/**
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* @see com.hardcode.gdbms.engine.values.Value#doHashCode()
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*/
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public int doHashCode() { |
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return 0; |
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} |
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public Value and(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value equals(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value greater(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value greaterEqual(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value less(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value lessEqual(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value like(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value notEquals(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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public Value or(Value value) throws IncompatibleTypesException { |
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return ValueFactory.createValue(false); |
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} |
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/**
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* @see com.hardcode.gdbms.engine.values.Value#getStringValue(com.hardcode.gdbms.engine.data.driver.ValueWriter)
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*/
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public String getStringValue(ValueWriter writer) { |
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return writer.getNullStatementString();
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} |
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/**
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* @see com.hardcode.gdbms.engine.values.Value#getSQLType()
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*/
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public int getSQLType() { |
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return Types.NULL; |
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} |
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public int getWidth() { |
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return 0; |
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} |
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} |